Abstract: In order to improve the deficiency of ventilation system in Shanxi Lyuliang Zhongyang Fujiayan Coal Limited Company, reduce the waste of manpower and resource, based on the analysis of the current situation of coalmine in Fujiayan Coal Mime, we find the drawbacks in the mine ventilation system. By closing the old mining area in south wing and changing the way of mine gas drainage, constructing and dismantling fire dam to optimize and adjust mine ventilation system, it changes the methane drainage in south mining area from 11.31 m³/min by pipes to 11.77 m³/min by tunnel, with an increase of 662.4 m³/d, which improved the utilization of the gas for power generation. The intake ventilation shaft and tunnel give full play to the stabilization and reliability of ventilation system.